F22 Toxins?

[Soapy1]

[URL="http://http://www.adn.com/2011/07/27/1987508/air-force-finds-multiple-toxins.html"]
Soapy

[glad rag]

Air Force finds multiple toxins in blood of woozy F-22 pilots: Alaska Newsreader | Alaska news at adn.com (http://www.adn.com/2011/07/27/1987508/air-force-finds-multiple-toxins.html)

The blood tests were performed after each of the 14 incidents in which pilots reported various cognitive dysfunctions and other symptoms of hypoxia. One couldn't remember how to change radio frequencies. Another scraped trees on his final approach to the runway - and later could not recall the incident.
"These guys are getting tested for toxins and they've [gotten] toxins out of their bloodstreams," the source said. "One of the guys was expelling propane."
This source, along with the others, requested anonymity for fear of retribution.

[jamesdevice]

propane can only come from the fuel or exhaust
Suggests that the earlier reports that the problems were due to running up the engines while still in hangar, resulting in the oxygen system re-ingesting exhaust fumes may be correct.
Difficult to see how propane can arise in any other way - its not what you'd expect as any kind of chemical breakdown product